(Reuters) – The European Union on Sunday accused Russian troops of committing atrocities in the Kyiv region after the mayor of the town of Bucha said 300 residents had been killed during a month-long occupation by Russian forces. “Shocked by news of atrocities committed by Russian forces. EU assists Ukraine in documenting war crimes,” EU foreign policy chief Josep Borrell said on Twitter, adding all cases needed to be pursued by the International Court of Justice. Ukraine said on Saturday its forces had retaken all areas around Kyiv, claiming complete control of the capital region for the firs…